EP0652063A1 - Knock-out device for casting cores - Google Patents

Knock-out device for casting cores Download PDF

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Publication number
EP0652063A1
EP0652063A1 EP94402482A EP94402482A EP0652063A1 EP 0652063 A1 EP0652063 A1 EP 0652063A1 EP 94402482 A EP94402482 A EP 94402482A EP 94402482 A EP94402482 A EP 94402482A EP 0652063 A1 EP0652063 A1 EP 0652063A1
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EP
European Patent Office
Prior art keywords
chassis
fixed
clamping
vertical
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94402482A
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German (de)
French (fr)
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EP0652063B1 (en
Inventor
Daniel Fallet
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MASSIN SA
Original Assignee
Dimafond Distribution et Ingenierie de Materiel pour la Fonderie
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Publication of EP0652063A1 publication Critical patent/EP0652063A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/005—Removing cores by vibrating or hammering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings

Definitions

  • the present invention relates to an improved device for cleaning the cores for casting casting parts.
  • the hollow parts of a casting are usually molded around sand cores of shapes complementary to those of the hollow parts.
  • the devices proposed are either complex and fragile, or do not give complete satisfaction and leave behind fragments of cores bonded to the foundry parts.
  • the object of the invention is to propose a simple and effective cleaning device, making it possible to obtain complete elimination of the casting cores, even in the case of a casting piece of complex shape such as a cylinder head of a combustion engine. internal.
  • the subject of the invention is a device for cleaning the cores from the casting of pieces of foundry, characterized in that it comprises a rigid chassis having a vertical axis of symmetry forming a virtual axis of oscillation of the chassis, defined by the intersection of the vertical median longitudinal and transverse planes of the chassis, this chassis being hung on a support fixed by elastically deformable connecting means, the cleaning device further comprising two devices for clamping pieces to be cleaned carried by two opposite ends of the chassis while being aligned in the median longitudinal plane, and two unbalance motors fixed on two opposite sides of the chassis, having axes of rotation parallel to the axis of symmetry of the chassis and aligned with this axis of symmetry in the median transverse plane, the motors being intended, in operation, to oscillate the chassis around its virtual axis, so that the center of gravity of each part to be decribed describes a substantially horizontal trajectory and ellipsoidal.
  • FIGS. 1 to 3 show a device according to the invention, designated by the general reference 10, for cleaning the cores of foundry parts, such as cylinder heads for internal combustion engines.
  • the device 10 is intended to unclog two casting pieces at a time, only one of which is shown in FIG. 2 for reasons of clarity.
  • the casting shown in this figure is an engine cylinder head P fitted with casting weights m.
  • the cleaning device 10 is placed in an anti-noise box 11 provided with closable access openings, as shown in FIG. 1.
  • the device 10 comprises a rigid chassis 12, of generally elongated shape, having a vertical axis of symmetry X forming a virtual axis of oscillation of the chassis, as will be described in more detail later, defined by the intersection of the longitudinal vertical median planes L and transverse T of the chassis, these planes being shown in phantom in FIG. 2.
  • the chassis 12 is hung on a fixed support 14 by means of four cylindrical articulations 16, of known type, of vertical axes, elastically deformable transversely, arranged symmetrically two by two with respect to the longitudinal median longitudinal planes L and transverse T.
  • the chassis 12 is provided with a framework comprising three horizontal plates 18 superimposed, of identical general shapes, connected to each other by two longitudinal vertical webs 20 welded to the horizontal plates 18, a single web 20 being shown in FIG. 3.
  • the width of the horizontal plates 18 is smaller in their middle part than in their end parts, the latter parts comprising rectangular cutouts 22 open opposite the axis of symmetry X.
  • the cleaning device 10 further comprises two devices 24 for clamping pieces to be cleaned carried by two ends of the chassis 12 while being aligned in the median longitudinal plane L, and two unbalanced motors 26 of known type, conventionally fixed on the two opposite sides of the chassis delimited by the narrow median parts of the horizontal plates 18.
  • the axes of rotation R of these motors 26 are parallel to the axis of symmetry X of the chassis 12 and aligned with this axis of symmetry in the median transverse plane T.
  • Each clamping device 24 is arranged between two vertical end plates 28, 30, symmetrical with respect to the median longitudinal plane L, fixed on the opposite edges of the cutouts 22.
  • a first end plate 28 forms a fixed clamping jaw and a second end plate 30 forms a support for at least one pneumatic cylinder with chamber 32, of known type, for example sold under the name "PNEURIDE" by the company PARKER.
  • the pneumatic cylinder 32 is provided with a fixed end hooked on the support 30 and with a movable end carrying a plate 34 parallel to the two end plates 28,30, forming a movable clamping jaw.
  • the jaws 28, 34 therefore delimit vertical clamping faces opposite which a piece to be stripped P is maintained.
  • the fixed jaws 28, respectively the movable jaws 34, of the two clamping devices 24 are mounted in opposition to each other relative to the median longitudinal plane L.
  • each clamping device 24 comprises two pneumatic cylinders with chamber 32 carrying the movable jaw 34, aligned vertically.
  • the number of pneumatic cylinders used in a clamping device depends on the weight of the part to be cleaned.
  • Horizontal grids 36 are arranged between the lower end of the end plates 28, 30 of the clamping devices. These grids 36 form supports facilitating the establishment and removal of the parts to be cleaned and allow the flow by gravity of the fragments of casting cores which are detached from these parts.
  • the fixed jaw 28 of a clamping device is perforated by orifices 38 delimiting passages for known means for hammering the foundry piece P.
  • hammering means comprise for example a pneumatic hammer 40, as shown in FIG. 2, intended to strike a part of the part to be cleaned, arranged in line with the orifices 38, this part being constituted for example by the casting weights m integral with the foundry part.
  • a plate can be interposed between the weights m and the hammer 40, especially when these weights are relatively fragile.
  • each of the parts to be stripped P is clamped between the jaws 28, 34 of the corresponding clamping devices 24 by supplying compressed air to the pneumatic cylinders 32.
  • each part P is hammered by means of the pneumatic hammer 40, according to a known method.
  • the unbalance motors 26 are started so that they rotate in identical directions indicated by arrows in FIG. 2.
  • the rotation of the motors 26 has the effect of making the chassis 12 oscillate around its virtual axis X, by elastically deforming the articulations 16 substantially in a horizontal plane, so that the center of gravity of each piece to be racked P oscillates by describing a substantially horizontal and ellipsoidal trajectory, of major transverse axis with respect to the chassis 12.
  • the oscillations have the effect of completely disintegrating the casting cores without any fragment remaining in the hollows of the casting parts.
  • the power of the unbalance motors 26 is adapted so that the amplitude of the oscillations of the parts to be stripped, measured along the major axis of the ellipsoidal trajectory is between 12 and 16 mm approximately.
  • each unbalance motor has a power of approximately 5 kW
  • each pneumatic cylinder is supplied with compressed air having a pressure of approximately 2 to 5 bars, so as to be able to unclog castings of variable weights.
  • the amplitude of the oscillations of the center of gravity of the parts to be cleaned, measured along the long axis of the ellipsoidal trajectory, is approximately 14 mm, that is to say 7 mm on either side of the position of rest of the center of gravity, this for a frequency of 1,500 oscillations / min, that is to say 1,500 vibrations / min around the rest position of the center of gravity.
  • the amplitude and frequency of the oscillations of the parts to be cleaned can vary depending on the setting of the unbalance motors. Furthermore, the power of these motors is chosen according to the weight of the parts to be cleaned.
  • the invention has many advantages.
  • the device according to the invention makes it possible to unclog two casting parts at the same time by subjecting them to vibrations transmitted by the chassis which carries them, without using the conventional transmission means with connecting rods and cranks which are complex and fragile. Therefore, the cleaning device according to the invention is very robust and reliable.
  • the vibrations produced by the cleaning device according to the invention have amplitudes and frequencies greater than those obtained in conventional devices, making it possible to completely disintegrate the casting cores without leaving any fragments inside the casting parts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Vehicle Body Suspensions (AREA)
  • Casting Devices For Molds (AREA)

Abstract

This device comprises a rigid chassis (12) having a vertical axis of symmetry (X) forming a virtual axis of oscillation of the chassis, defined by the intersection of the longitudinal and transverse vertical median planes of the chassis, this chassis being attached to a stationary support (14) by elastically deformable linking means (16). The knock-out device comprises, moreover, two devices (24) for gripping components to be knocked out, which are carried by two opposite ends of the chassis (12), being aligned in the median longitudinal plane, and two unbalance (unbalanced mass) motors (26) fixed on two opposite sides of the chassis (12), having axes of rotation parallel to the axis of symmetry (X) of the chassis (12) and aligned with this axis of symmetry in the transverse median plane, the motors (26) being intended, when operating, to make the chassis (12) oscillate about its virtual axis (X) so that the centre of gravity of each component to be knocked out describes a substantially horizontal and ellipsoid trajectory. <IMAGE>

Description

La présente invention concerne un dispositif perfectionné de débourrage de noyaux de coulée de pièces de fonderie.The present invention relates to an improved device for cleaning the cores for casting casting parts.

Elle s'applique en général au débourrage de noyaux de sable dans des pièces de fonderie creuses, et plus particulièrement dans des culasses ou dans des collecteurs pour moteurs à combustion interne.It generally applies to the settling of sand cores in hollow casting parts, and more particularly in cylinder heads or in manifolds for internal combustion engines.

Les parties creuses d'une pièce de fonderie sont habituellement moulées autour de noyaux de sable de formes complémentaires à celles des parties creuses.The hollow parts of a casting are usually molded around sand cores of shapes complementary to those of the hollow parts.

L'élimination des noyaux de coulée, après moulage d'une pièce de fonderie, est d'autant plus difficile à réaliser que cette pièce de fonderie a une forme complexe.The elimination of the casting cores, after molding a foundry part, is all the more difficult to achieve since this foundry part has a complex shape.

Il est connu d'éliminer les noyaux de coulée dans une pièce de fonderie de forme complexe, telle qu'une culasse de moteur, en soumettant cette pièce à un martelage, afin de décrocher les noyaux de sable, puis à des vibrations, afin de désagréger les noyaux de sable et évacuer les fragments de noyaux par gravité.It is known to eliminate the casting cores in a casting piece of complex shape, such as an engine cylinder head, by subjecting this part to a hammering, in order to unhook the sand cores, then to vibrations, in order to disintegrate the nuclei of sand and evacuate the fragments of nuclei by gravity.

Il existe dans l'état de la technique différents types de dispositifs de débourrage permettant de faire vibrer une pièce de fonderie afin de désagréger les noyaux de coulée.In the state of the art, there are different types of cleaning devices making it possible to vibrate a foundry part in order to disintegrate the casting cores.

Cependant, les dispositifs proposés soit sont complexes et fragiles, soit ne donnent pas entière satisfaction et laissent subsister des fragments de noyaux collés sur les pièces de fonderie.However, the devices proposed are either complex and fragile, or do not give complete satisfaction and leave behind fragments of cores bonded to the foundry parts.

L'invention a pour but de proposer un dispositif de débourrage simple et efficace, permettant d'obtenir une élimination complète des noyaux de coulée, même dans le cas d'une pièce de fonderie de forme complexe telle qu'une culasse de moteur à combustion interne.The object of the invention is to propose a simple and effective cleaning device, making it possible to obtain complete elimination of the casting cores, even in the case of a casting piece of complex shape such as a cylinder head of a combustion engine. internal.

A cet effet l'invention a pour objet un dispositif de débourrage de noyaux de coulée de pièces de fonderie, caractérisé en ce qu'il comprend un châssis rigide ayant un axe de symétrie vertical formant un axe virtuel d'oscillation du châssis, défini par l'intersection des plans médians verticaux longitudinal et transversal du châssis, ce châssis étant accroché sur un support fixe par des moyens de liaison déformables élastiquement, le dispositif de débourrage comprenant de plus deux dispositifs de serrage de pièces à débourrer portés par deux extrémités opposées du châssis en étant alignés dans le plan longitudinal médian, et deux moteurs à balourd fixés sur deux côtés opposés du châssis, ayant des axes de rotation parallèles à l'axe de symétrie du châssis et alignés avec cet axe de symétrie dans le plan transversal médian, les moteurs étant destinés, en fonctionnement, à faire osciller le châssis autour de son axe virtuel, de manière que le centre de gravité de chaque pièce à débourrer décrive une trajectoire sensiblement horizontale et ellipsoïdale.To this end, the subject of the invention is a device for cleaning the cores from the casting of pieces of foundry, characterized in that it comprises a rigid chassis having a vertical axis of symmetry forming a virtual axis of oscillation of the chassis, defined by the intersection of the vertical median longitudinal and transverse planes of the chassis, this chassis being hung on a support fixed by elastically deformable connecting means, the cleaning device further comprising two devices for clamping pieces to be cleaned carried by two opposite ends of the chassis while being aligned in the median longitudinal plane, and two unbalance motors fixed on two opposite sides of the chassis, having axes of rotation parallel to the axis of symmetry of the chassis and aligned with this axis of symmetry in the median transverse plane, the motors being intended, in operation, to oscillate the chassis around its virtual axis, so that the center of gravity of each part to be decribed describes a substantially horizontal trajectory and ellipsoidal.

Suivant d'autres caractéristiques de l'invention:

  • les moyens reliant le châssis au support comprennent quatre articulations cylindriques d'axes verticaux, déformables élastiquement transversalement, disposées symétriquement deux à deux par rapport aux plans médians verticaux longitudinal et transversal ;
  • chaque dispositif de serrage comprend une mâchoire fixe et une mâchoire mobile délimitant des faces verticales de serrage en vis-à-vis entre lesquelles est maintenue une pièce à débourrer ;
  • la mâchoire mobile est portée par au moins un vérin pneumatique à chambre ;
  • les mâchoires fixes, respectivement les mâchoires mobiles, des deux dispositifs de serrage sont montées en opposition l'une de l'autre par rapport au plan vertical longitudinal médian ;
  • la partie médiane du châssis sur laquelle sont fixés les moteurs est plus étroite que les parties d'extrémité du châssis portant les dispositifs de serrage;
  • le châssis est muni d'une ossature comportant des plaques horizontales reliées entre elles par des âmes longitudinales verticales ;
  • chaque dispositif de serrage comprend deux plaques verticales d'extrémité symétriques par rapport au plan longitudinal médian, fixées sur les bords opposés de découpes rectangulaires ménagées dans les extrémités correspondantes des plaques horizontales de l'ossature, une première plaque d'extrémité formant la mâchoire fixe du dispositif de serrage, la seconde plaque d'extrémité formant un support pour une extrémité fixe du vérin pneumatique, le dispositif de serrage comportant en outre une troisième plaque parallèle à la mâchoire fixe, portée par l'extrémité mobile du vérin pneumatique, formant la mâchoire mobile du dispositif de serrage ;
  • les mâchoires fixes des dispositifs de serrage comprennent des orifices de passage pour des moyens de martelage des pièces maintenues dans les dispositifs de serrage.
According to other characteristics of the invention:
  • the means connecting the chassis to the support comprise four cylindrical articulations of vertical axes, elastically deformable transversely, arranged symmetrically two by two with respect to the longitudinal and transverse vertical median planes;
  • each clamping device comprises a fixed jaw and a movable jaw defining vertical clamping faces vis-à-vis between which is held a part to be cleaned;
  • the movable jaw is carried by at least one pneumatic cylinder with chamber;
  • the fixed jaws, respectively the movable jaws, of the two clamping devices are mounted in opposition to each other with respect to the median longitudinal vertical plane;
  • the middle part of the chassis on which the motors are fixed is narrower than the end parts of the chassis carrying the clamping devices;
  • the chassis is provided with a framework comprising horizontal plates connected together by vertical longitudinal webs;
  • each clamping device comprises two vertical end plates symmetrical with respect to the median longitudinal plane, fixed on the opposite edges of rectangular cutouts formed in the corresponding ends of the horizontal plates of the frame, a first end plate forming the fixed jaw of the clamping device, the second end plate forming a support for a fixed end of the pneumatic jack, the clamping device further comprising a third plate parallel to the fixed jaw, carried by the movable end of the pneumatic jack, forming the movable jaw of the clamping device;
  • the fixed jaws of the clamping devices comprise passage orifices for means of hammering the parts held in the clamping devices.

Un exemple de réalisation de l'invention sera décrit ci-dessous en se référant aux dessins annexés dans lesquels :

  • la figure 1 est une vue en perspective d'un dispositif de débourrage selon l'invention ;
  • la figure 2 est une vue de dessus du dispositif de débourrage de la figure 1 ;
  • la figure 3 est une demie vue en coupe selon la ligne 3-3 de la figure 2, à échelle agrandie.
An exemplary embodiment of the invention will be described below with reference to the accompanying drawings in which:
  • Figure 1 is a perspective view of a cleaning device according to the invention;
  • Figure 2 is a top view of the cleaning device of Figure 1;
  • Figure 3 is a half sectional view along line 3-3 of Figure 2, on an enlarged scale.

On a représenté aux figures 1 à 3 un dispositif selon l'invention, désigné par la référence générale 10, pour le débourrage de noyaux de pièces de fonderie, telles que des culasses pour moteurs à combustion interne.FIGS. 1 to 3 show a device according to the invention, designated by the general reference 10, for cleaning the cores of foundry parts, such as cylinder heads for internal combustion engines.

Le dispositif 10 est destiné à débourrer deux pièces de fonderie à la fois dont une seule est représentée à la figure 2 pour des raisons de clarté. La pièce de fonderie représentée sur cette figure est une culasse de moteur P munie de masselottes de coulée m.The device 10 is intended to unclog two casting pieces at a time, only one of which is shown in FIG. 2 for reasons of clarity. The casting shown in this figure is an engine cylinder head P fitted with casting weights m.

De préférence, le dispositif de débourrage 10 est placé dans un caisson 11 anti-bruit muni d'ouvertures d'accès obturables, tel que représenté sur la figure 1.Preferably, the cleaning device 10 is placed in an anti-noise box 11 provided with closable access openings, as shown in FIG. 1.

Le dispositif 10 comporte un châssis rigide 12, de forme générale allongée, ayant un axe de symétrie vertical X formant un axe virtuel d'oscillation du châssis, comme cela sera décrit plus en détail ultérieurement, défini par l'intersection des plans médians verticaux longitudinal L et transversal T du châssis, ces plans étant représentés en trait mixte sur la figure 2.The device 10 comprises a rigid chassis 12, of generally elongated shape, having a vertical axis of symmetry X forming a virtual axis of oscillation of the chassis, as will be described in more detail later, defined by the intersection of the longitudinal vertical median planes L and transverse T of the chassis, these planes being shown in phantom in FIG. 2.

Le châssis 12 est accroché sur un support fixe 14 au moyen de quatre articulations cylindriques 16, de type connu, d'axes verticaux, déformables élastiquement transversalement, disposées symétriquement deux à deux par rapport aux plans médians verticaux longitudinal L et transversal T.The chassis 12 is hung on a fixed support 14 by means of four cylindrical articulations 16, of known type, of vertical axes, elastically deformable transversely, arranged symmetrically two by two with respect to the longitudinal median longitudinal planes L and transverse T.

Le châssis 12 est muni d'une ossature comportant trois plaques horizontales 18 superposées, de formes générales identiques, reliées entre elles par deux âmes verticales longitudinales 20 soudées sur les plaques horizontales 18, une seule âme 20 étant représentée sur la figure 3.The chassis 12 is provided with a framework comprising three horizontal plates 18 superimposed, of identical general shapes, connected to each other by two longitudinal vertical webs 20 welded to the horizontal plates 18, a single web 20 being shown in FIG. 3.

La largeur des plaques horizontales 18 est plus faible dans leur partie médiane que dans leurs parties d'extrémités, ces dernières parties comportant des découpes rectangulaires 22 ouvertes à l'opposée de l'axe de symétrie X.The width of the horizontal plates 18 is smaller in their middle part than in their end parts, the latter parts comprising rectangular cutouts 22 open opposite the axis of symmetry X.

Le dispositif de débourrage 10 comprend en outre deux dispositifs 24 de serrage de pièces à débourrer portés par deux extrémités du châssis 12 en étant alignés dans le plan longitudinal médian L, et deux moteurs 26 à balourd, de type connu, fixés de façon classique sur les deux côtés opposés du châssis délimités par les parties médianes étroites des plaques horizontales 18. Les axes de rotation R de ces moteurs 26 sont parallèles à l'axe de symétrie X du châssis 12 et alignés avec cet axe de symétrie dans le plan transversal médian T.The cleaning device 10 further comprises two devices 24 for clamping pieces to be cleaned carried by two ends of the chassis 12 while being aligned in the median longitudinal plane L, and two unbalanced motors 26 of known type, conventionally fixed on the two opposite sides of the chassis delimited by the narrow median parts of the horizontal plates 18. The axes of rotation R of these motors 26 are parallel to the axis of symmetry X of the chassis 12 and aligned with this axis of symmetry in the median transverse plane T.

Chaque dispositif de serrage 24 est agencé entre deux plaques verticales d'extrémité 28,30, symétriques par rapport au plan longitudinal médian L, fixées sur les bords opposés des découpes 22. Une première plaque d'extrémité 28 forme une mâchoire fixe de serrage et une seconde plaque d'extrémité 30 forme un support pour au moins un vérin pneumatique à chambre 32, de type connu, par exemple commercialisé sous le nom "PNEURIDE" par la société PARKER. Le vérin pneumatique 32 est muni d'une extrémité fixe accrochée sur le support 30 et d'une extrémité mobile portant une plaque 34 parallèle aux deux plaques d'extrémité 28,30, formant une mâchoire mobile de serrage.Each clamping device 24 is arranged between two vertical end plates 28, 30, symmetrical with respect to the median longitudinal plane L, fixed on the opposite edges of the cutouts 22. A first end plate 28 forms a fixed clamping jaw and a second end plate 30 forms a support for at least one pneumatic cylinder with chamber 32, of known type, for example sold under the name "PNEURIDE" by the company PARKER. The pneumatic cylinder 32 is provided with a fixed end hooked on the support 30 and with a movable end carrying a plate 34 parallel to the two end plates 28,30, forming a movable clamping jaw.

Les mâchoires 28,34 délimitent donc des faces verticales de serrage en vis-à-vis entre lesquelles est maintenue une pièce à débourrer P.The jaws 28, 34 therefore delimit vertical clamping faces opposite which a piece to be stripped P is maintained.

De manière à équilibrer le châssis 12 autour de son axe de symétrie, les mâchoires fixes 28, respectivement les mâchoires mobiles 34, des deux dispositifs de serrage 24 sont montées en opposition l'une de l'autre par rapport au plan longitudinal médian L.In order to balance the chassis 12 around its axis of symmetry, the fixed jaws 28, respectively the movable jaws 34, of the two clamping devices 24 are mounted in opposition to each other relative to the median longitudinal plane L.

Dans l'exemple représenté sur les figures, chaque dispositif de serrage 24 comporte deux vérins pneumatiques à chambre 32 portant la mâchoire mobile 34, alignés verticalement. Le nombre de vérins pneumatiques utilisés dans un dispositif de serrage dépend du poids de la pièce à débourrer.In the example shown in the figures, each clamping device 24 comprises two pneumatic cylinders with chamber 32 carrying the movable jaw 34, aligned vertically. The number of pneumatic cylinders used in a clamping device depends on the weight of the part to be cleaned.

Des grilles horizontales 36 sont disposées entre l'extrémité inférieure des plaques d'extrémité 28,30 des dispositifs de serrage. Ces grilles 36 forment des supports facilitant la mise en place et le retrait des pièces à débourrer et permettent l'écoulement par gravité des fragments de noyaux de coulée qui se décrochent de ces pièces.Horizontal grids 36 are arranged between the lower end of the end plates 28, 30 of the clamping devices. These grids 36 form supports facilitating the establishment and removal of the parts to be cleaned and allow the flow by gravity of the fragments of casting cores which are detached from these parts.

En se référant à la figure 1, on voit que la mâchoire fixe 28 d'un dispositif de serrage est ajourée par des orifices 38 délimitant des passages pour des moyens connus de martelage de la pièce de fonderie P. Ces moyens de martelage comprennent par exemple un marteau pneumatique 40, tel que représenté sur la figure 2, destiné à frapper une partie de la pièce à débourrer disposée au droit des orifices 38, cette partie étant constituée par exemple par les masselottes de coulée m solidaires de la pièce de fonderie.Referring to FIG. 1, it can be seen that the fixed jaw 28 of a clamping device is perforated by orifices 38 delimiting passages for known means for hammering the foundry piece P. These hammering means comprise for example a pneumatic hammer 40, as shown in FIG. 2, intended to strike a part of the part to be cleaned, arranged in line with the orifices 38, this part being constituted for example by the casting weights m integral with the foundry part.

En variante, une plaque peut être intercalée entre les masselottes m et le marteau 40, notamment lorsque ces masselottes sont relativement fragiles.Alternatively, a plate can be interposed between the weights m and the hammer 40, especially when these weights are relatively fragile.

Le fonctionnement du dispositif de débourrage représenté sur les figures est très simple.The operation of the cleaning device shown in the figures is very simple.

Tout d'abord, on serre chacune des pièces à débourrer P entre les mâchoires 28,34 des dispositifs de serrage 24 correspondants en alimentant en air comprimé les vérins pneumatiques 32.First of all, each of the parts to be stripped P is clamped between the jaws 28, 34 of the corresponding clamping devices 24 by supplying compressed air to the pneumatic cylinders 32.

Puis, les moteurs à balourd 26 étant arrêtés, on martèle chaque pièce P au moyen du marteau pneumatique 40,selon un procédé connu.Then, the unbalance motors 26 being stopped, each part P is hammered by means of the pneumatic hammer 40, according to a known method.

Après l'opération de martelage, on met en marche les moteurs à balourd 26 de manière qu'ils tournent dans des sens identiques indiqués par des flèches sur la figure 2.After the hammering operation, the unbalance motors 26 are started so that they rotate in identical directions indicated by arrows in FIG. 2.

La rotation des moteurs 26 a pour effet de faire osciller le châssis 12 autour de son axe virtuel X, en déformant élastiquement les articulations 16 sensiblement dans un plan horizontal, de manière que le centre de gravité de chaque pièce à débourrer P oscille en décrivant une trajectoire sensiblement horizontale et ellipsoïdale, de grand axe transversal par rapport au châssis 12.The rotation of the motors 26 has the effect of making the chassis 12 oscillate around its virtual axis X, by elastically deforming the articulations 16 substantially in a horizontal plane, so that the center of gravity of each piece to be racked P oscillates by describing a substantially horizontal and ellipsoidal trajectory, of major transverse axis with respect to the chassis 12.

Les oscillations ont pour effet de désagréger complètement les noyaux de coulée sans qu'aucun fragment ne subsiste dans les creux des pièces de fonderie.The oscillations have the effect of completely disintegrating the casting cores without any fragment remaining in the hollows of the casting parts.

De préférence, la puissance des moteurs à balourd 26 est adaptée pour que l'amplitude des oscillations des pièces à débourrer, mesurée suivant le grand axe de la trajectoire ellipsoïdale soit comprise entre 12 et 16 mm environ.Preferably, the power of the unbalance motors 26 is adapted so that the amplitude of the oscillations of the parts to be stripped, measured along the major axis of the ellipsoidal trajectory is between 12 and 16 mm approximately.

Dans l'exemple décrit, chaque moteur à balourd a une puissance de 5 kW environ, et chaque vérin pneumatique est alimenté en air comprimé ayant une pression de 2 à 5 bars environ, de manière à pouvoir débourrer des pièces de fonderie de poids variables.In the example described, each unbalance motor has a power of approximately 5 kW, and each pneumatic cylinder is supplied with compressed air having a pressure of approximately 2 to 5 bars, so as to be able to unclog castings of variable weights.

L'amplitude des oscillations du centre de gravité des pièces à débourrer, mesurée suivant le grand axe de la trajectoire ellipsoïdale, est d'environ 14 mm, c'est-à-dire 7 mm de part et d'autre de la position de repos du centre de gravité, ceci pour une fréquence de 1.500 oscillations/mn, c'est-à-dire 1.500 alternances/mn autour de la position de repos du centre de gravité.The amplitude of the oscillations of the center of gravity of the parts to be cleaned, measured along the long axis of the ellipsoidal trajectory, is approximately 14 mm, that is to say 7 mm on either side of the position of rest of the center of gravity, this for a frequency of 1,500 oscillations / min, that is to say 1,500 vibrations / min around the rest position of the center of gravity.

Bien entendu, l'amplitude et la fréquence des oscillations des pièces à débourrer peuvent varier en fonction du réglage des moteurs à balourd. Par ailleurs, la puissance de ces moteurs est choisie en fonction du poids des pièces à débourrer.Of course, the amplitude and frequency of the oscillations of the parts to be cleaned can vary depending on the setting of the unbalance motors. Furthermore, the power of these motors is chosen according to the weight of the parts to be cleaned.

L'invention comporte de nombreux avantages.The invention has many advantages.

Le dispositif selon l'invention permet de débourrer deux pièces de fonderie à la fois en soumettant celles-ci à des vibrations transmises par le châssis qui les porte, sans utiliser les moyens de transmission classiques à bielles et manivelles qui sont complexes et fragiles. De ce fait, le dispositif de débourrage selon l'invention est très robuste et fiable.The device according to the invention makes it possible to unclog two casting parts at the same time by subjecting them to vibrations transmitted by the chassis which carries them, without using the conventional transmission means with connecting rods and cranks which are complex and fragile. Therefore, the cleaning device according to the invention is very robust and reliable.

Les vibrations produites par le dispositif de débourrage selon l'invention ont des amplitudes et des fréquences supérieures à celles obtenues dans les dispositifs classiques, permettant de désagréger complètement les noyaux de coulée sans laisser subsister aucun fragment à l'intérieur des pièces de fonderie.The vibrations produced by the cleaning device according to the invention have amplitudes and frequencies greater than those obtained in conventional devices, making it possible to completely disintegrate the casting cores without leaving any fragments inside the casting parts.

Claims (9)

Dispositif de débourrage de noyaux de coulée de pièces de fonderie, caractérisé en ce qu'il comprend un châssis rigide (12) ayant un axe de symétrie vertical (X) formant un axe virtuel d'oscillation du châssis, défini par l'intersection des plans médians verticaux longitudinal (L) et transversal (T) du châssis, ce châssis étant accroché sur un support fixe (14) par des moyens de liaison (16) déformables élastiquement, le dispositif de débourrage comprenant de plus deux dispositifs (24) de serrage de pièces à débourrer portés par deux extrémités opposées du châssis (12) en étant alignés dans le plan longitudinal médian (L), et deux moteurs à balourd (26) fixés sur deux côtés opposés du châssis (12), ayant des axes de rotation (R) parallèles à l'axe de symétrie (X) du châssis (12) et alignés avec cet axe de symétrie dans le plan transversal médian (T), les moteurs (26) étant destinés, en fonctionnement, à faire osciller le châssis (12) autour de son axe virtuel (X), de manière que le centre de gravité de chaque pièce à débourrer décrive une trajectoire sensiblement horizontale et ellipsoïdale.Device for cleaning the casting cores of foundry pieces, characterized in that it comprises a rigid frame (12) having a vertical axis of symmetry (X) forming a virtual axis of oscillation of the frame, defined by the intersection of the longitudinal (L) and transverse (T) vertical median planes of the chassis, this chassis being hung on a fixed support (14) by elastically deformable connecting means (16), the cleaning device further comprising two devices (24) for clamping of work pieces carried by two opposite ends of the chassis (12) being aligned in the median longitudinal plane (L), and two unbalance motors (26) fixed on two opposite sides of the chassis (12), having axes of rotation (R) parallel to the axis of symmetry (X) of the chassis (12) and aligned with this axis of symmetry in the median transverse plane (T), the motors (26) being intended, in operation, to oscillate the frame (12) around of its virtual axis (X), so that the center of gravity of each part to be decribed describes a substantially horizontal and ellipsoidal trajectory. Dispositif selon la revendication 1, caractérisé en ce que les moyens reliant le châssis (12) au support (14) comprennent quatre articulations cylindriques (16) d'axes verticaux, déformables élastiquement transversalement, disposées symétriquement deux à deux par rapport aux plans médians verticaux longitudinal (L) et transversal (T).Device according to claim 1, characterized in that the means connecting the chassis (12) to the support (14) comprise four cylindrical articulations (16) of vertical axes, elastically deformable transversely, arranged symmetrically in pairs with respect to the vertical median planes longitudinal (L) and transverse (T). Dispositif selon la revendication 1 ou 2, caractérisé en ce que chaque dispositif de serrage (24) comprend une mâchoire fixe (28) et une mâchoire mobile (34) délimitant des faces verticales de serrage en vis-à-vis entre lesquelles est maintenue une pièce à débourrer.Device according to claim 1 or 2, characterized in that each clamping device (24) comprises a fixed jaw (28) and a movable jaw (34) delimiting vertical clamping faces vis-à-vis between which is held a part to be cleaned. Dispositif selon la revendication 3, caractérisé en ce que la mâchoire mobile (34) est portée par au moins un vérin pneumatique à chambre (32).Device according to claim 3, characterized in that the movable jaw (34) is carried by at least one pneumatic cylinder with chamber (32). Dispositif selon la revendication 3 ou 4, caractérisé en ce que les mâchoires fixes (28), respectivement les mâchoires mobiles (34), des deux dispositifs de serrage (24) sont montées en opposition l'une de l'autre par rapport au plan vertical longitudinal médian (L).Device according to claim 3 or 4, characterized in that the fixed jaws (28) and the movable jaws (34), respectively, of the two clamping devices (24) are mounted in opposition to each other with respect to the plane vertical longitudinal median (L). Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la partie médiane du châssis (12) sur laquelle sont fixés les moteurs (26) est plus étroite que les parties d'extrémité du châssis (12) portant les dispositifs de serrage (24).Device according to any one of Claims 1 to 5, characterized in that the central part of the chassis (12) on which the motors (26) are fixed is narrower than the end parts of the chassis (12) carrying the devices clamping (24). Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le châssis (12) est muni d'une ossature comportant des plaques horizontales (18) reliées entre elles par des âmes longitudinales verticales (20).Device according to any one of Claims 1 to 6, characterized in that the chassis (12) is provided with a framework comprising horizontal plates (18) connected to each other by vertical longitudinal webs (20). Dispositif selon les revendications 3 et 7 prises ensemble, caractérisé en ce que chaque dispositif de serrage (24) comprend deux plaques verticales d'extrémité (28,30) symétriques par rapport au plan longitudinal médian (L), fixées sur les bords opposés de découpes rectangulaires (22) ménagées dans les extrémités correspondantes des plaques horizontales de l'ossature, une première plaque d'extrémité (28) formant la mâchoire fixe du dispositif de serrage, la seconde plaque d'extrémité (30) formant un support pour une extrémité fixe du vérin pneumatique (32), le dispositif de serrage (24) comportant en outre une troisième plaque (34) parallèle à la mâchoire fixe (28), portée par l'extrémité mobile du vérin pneumatique (32), formant la mâchoire mobile du dispositif de serrage (24).Device according to claims 3 and 7 taken together, characterized in that each clamping device (24) comprises two vertical end plates (28,30) symmetrical with respect to the median longitudinal plane (L), fixed on the opposite edges of rectangular cutouts (22) formed in the corresponding ends of the horizontal plates of the frame, a first end plate (28) forming the fixed jaw of the clamping device, the second end plate (30) forming a support for a fixed end of the pneumatic cylinder (32), the clamping device (24) further comprising a third plate (34) parallel to the fixed jaw (28), carried by the mobile end of the pneumatic cylinder (32), forming the jaw mobile clamping device (24). Dispositif selon l'une quelconque des revendications 3 à 8, caractérisé en ce que les mâchoires fixes (28) des dispositifs de serrage (24) comprennent des orifices (38) de passage pour des moyens (40) de martelage des pièces maintenues dans les dispositifs de serrage.Device according to any one of Claims 3 to 8, characterized in that the fixed jaws (28) of the clamping devices (24) comprise orifices (38) for passage for means (40) for hammering the parts held in the clamping devices.
EP94402482A 1993-11-05 1994-11-03 Knock-out device for casting cores Expired - Lifetime EP0652063B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9313208A FR2711931B1 (en) 1993-11-05 1993-11-05 Improved device for cleaning the cores of casting of foundry parts.
FR9313208 1993-11-05
US08/583,719 US5758713A (en) 1993-11-05 1996-01-05 Device for decoring cores of castings
CA002166836A CA2166836A1 (en) 1993-11-05 1996-01-09 Device for decoring cores of castings

Publications (2)

Publication Number Publication Date
EP0652063A1 true EP0652063A1 (en) 1995-05-10
EP0652063B1 EP0652063B1 (en) 1999-10-20

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EP94402482A Expired - Lifetime EP0652063B1 (en) 1993-11-05 1994-11-03 Knock-out device for casting cores

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US (1) US5758713A (en)
EP (1) EP0652063B1 (en)
CA (1) CA2166836A1 (en)
DE (1) DE69421240T2 (en)
ES (1) ES2141809T3 (en)
FR (1) FR2711931B1 (en)

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Also Published As

Publication number Publication date
FR2711931A1 (en) 1995-05-12
CA2166836A1 (en) 1997-07-10
US5758713A (en) 1998-06-02
ES2141809T3 (en) 2000-04-01
DE69421240T2 (en) 2000-07-13
EP0652063B1 (en) 1999-10-20
DE69421240D1 (en) 1999-11-25
FR2711931B1 (en) 1996-02-09

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